Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/FilterDataAccess.java @ 157:d5268ca7715b
Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 09 Mar 2011 05:22:17 +0100 |
parents | src/com/tmate/hgkit/fs/FilterDataAccess.java@9429c7bd1920 |
children | b413b16d10a5 |
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1 /* |
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2 * Copyright (c) 2011 TMate Software Ltd |
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3 * |
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4 * This program is free software; you can redistribute it and/or modify |
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5 * it under the terms of the GNU General Public License as published by |
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6 * the Free Software Foundation; version 2 of the License. |
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7 * |
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8 * This program is distributed in the hope that it will be useful, |
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 * GNU General Public License for more details. |
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12 * |
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13 * For information on how to redistribute this software under |
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14 * the terms of a license other than GNU General Public License |
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15 * contact TMate Software at support@hg4j.com |
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16 */ |
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17 package org.tmatesoft.hg.internal; |
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18 |
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19 import java.io.IOException; |
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20 |
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21 |
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22 /** |
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23 * XXX Perhaps, DataAccessSlice? Unlike FilterInputStream, we limit amount of data read from DataAccess being filtered. |
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24 * |
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25 * |
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26 * @author Artem Tikhomirov |
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27 * @author TMate Software Ltd. |
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28 */ |
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29 public class FilterDataAccess extends DataAccess { |
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30 private final DataAccess dataAccess; |
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31 private final long offset; |
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32 private final int length; |
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33 private int count; |
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34 |
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35 public FilterDataAccess(DataAccess dataAccess, long offset, int length) { |
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36 this.dataAccess = dataAccess; |
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37 this.offset = offset; |
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38 this.length = length; |
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39 count = length; |
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40 } |
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41 |
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42 protected int available() { |
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43 return count; |
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44 } |
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45 |
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46 @Override |
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47 public FilterDataAccess reset() throws IOException { |
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48 count = length; |
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49 return this; |
51
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50 } |
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51 |
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52 @Override |
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53 public boolean isEmpty() { |
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54 return count <= 0; |
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55 } |
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56 |
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57 @Override |
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58 public long length() { |
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59 return length; |
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60 } |
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61 |
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62 @Override |
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63 public void seek(long localOffset) throws IOException { |
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64 if (localOffset < 0 || localOffset > length) { |
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65 throw new IllegalArgumentException(); |
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66 } |
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67 dataAccess.seek(offset + localOffset); |
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68 count = (int) (length - localOffset); |
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69 } |
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70 |
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71 @Override |
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72 public void skip(int bytes) throws IOException { |
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73 int newCount = count - bytes; |
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74 if (newCount < 0 || newCount > length) { |
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75 throw new IllegalArgumentException(); |
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76 } |
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77 seek(length - newCount); |
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78 /* |
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79 can't use next code because don't want to rewind backing DataAccess on reset() |
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80 i.e. this.reset() modifies state of this instance only, while filtered DA may go further. |
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81 Only actual this.skip/seek/read would rewind it to desired position |
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82 dataAccess.skip(bytes); |
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83 count = newCount; |
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84 */ |
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85 |
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86 } |
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87 |
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88 @Override |
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89 public byte readByte() throws IOException { |
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90 if (count <= 0) { |
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91 throw new IllegalArgumentException("Underflow"); // XXX be descriptive |
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92 } |
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93 if (count == length) { |
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94 dataAccess.seek(offset); |
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95 } |
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96 count--; |
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97 return dataAccess.readByte(); |
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98 } |
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99 |
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100 @Override |
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101 public void readBytes(byte[] b, int off, int len) throws IOException { |
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102 if (count <= 0 || len > count) { |
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103 throw new IllegalArgumentException("Underflow"); // XXX be descriptive |
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104 } |
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105 if (count == length) { |
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106 dataAccess.seek(offset); |
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107 } |
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108 dataAccess.readBytes(b, off, len); |
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109 count -= len; |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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110 } |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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111 |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
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112 // done shall be no-op, as we have no idea what's going on with DataAccess we filter |
9429c7bd1920
Try DataAccess to reach revision data instead of plain byte arrays
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
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113 } |